Your shoulder is made up of three bones: your upper arm bone (humerus), your shoulder blade (scapula), and your collarbone (clavicle). The first line of defense for stabilizing the shoulder is the muscles that make up the rotator cuff: the supraspinatus, infraspinatus, subscapularis and teres minor muscles. Picture 2. What are the muscles that abduct the shoulder? The glenohumeral joint is where the ball (humeral head) and the socket (the glenoid) meet. They all insert to the deltoid tuberosity. The axillary nerve supplies the muscle. Shoulder Anatomy. Muscles That Act On The Anterior Shoulder. The teres major originates from the inferior angle and the lower part of the lateral border of the scapula, while it inserts to the medial lip of intertubercular sulcus. It stabilizes the shoulder and holds the head of the humerus into the glenoid cavity to maintain the principal shoulder joint. The anterior portion arises from the anterior border and superior surface of the clavicle. The right scapula from the front and back side. The posterior axio-appendicular muscles are divided into two groups; extrinsic and intrinsic. Extensor muscles of the forarm 13p Image Quiz. The muscles in the shoulder aid in a wide range of movement and help protect and maintain the main shoulder joint, known as the glenohumeral joint. The functions of the deltoid muscle are related to the shoulder joint and include the arm flexion, arm internal rotation (clavicular part), arm abduction (acromial part), arm extension and arm lateral rotation (spinal part). Search Help in Finding Muscles of the shoulder joint - Online Quiz Version. Read more. These muscles produce a large spectrum of arm movements which include internal and external arm rotation, arm abduction and arm adduction. The rhomboid minor muscle originates from the nuchal ligament and the spinous processes of the vertebrae C7-T1 and inserts to the root of the spine of scapula. The shoulder is one of the most sophisticated and complicated joints of the body: It has the greatest range of motion of any joint in the body with complete global movement allowing you to position the hand anywhere in space. The Anatomy of the Shoulder The shoulder is made up of two joints, the acromioclavicular joint and the glenohumeral joint. The trapezius muscle is a large muscle that defines the nuchal region. The shoulder joint, also known as the glenohumeral joint, is a ball and socket joint with the most extensive range of motion in the human body. Anterior axio-appendicular muscles (thoraco-appendicular muscles), Posterior axio-appendicular muscles (scapulo-humeral muscles). The deltoid muscle has three parts; the clavicular, acromial and spinal part. Register now Learn about these muscles, their origin and insertion points, and their functional anatomy. The sternocostal head originates from the anterior surface of the sternum and rib cartilages 1-6, while its abdominal head originates from the anterior layer of the rectus sheath. The head of your upper arm bone fits into a rounded socket in your shoulder blade. At the elbow, it connects primarily to the ulna, as the forearm's radial bone connects to the wrist. Dimitrios Mytilinaios MD, PhD The proximal humerus is the point of attachment for many of ligaments and muscles of the shoulder complex. © 2005-2021 Healthline Media a Red Ventures Company. The muscle is innervated by the thoracodorsal nerve. To make your student life even easier, we’ve created these muscle anatomy reference charts for you. Learn anatomy faster and remember everything you learn. Origin – Posterior surface of the scapula (below the spine of the scapula). The medial pectoral nerve supplies the muscle. There are two rhomboid muscles; rhomboid minor and rhomboid major. Moore, K. L., Dalley, A. F., & Agur, A. M. R. (2014). The muscle is innervated by the branches of the spinal accessory nerve (CN XI) and the anterior rami of spinal nerves C3-C4 via the cervical plexus. Some of the most important include the major digestive organs, the intestines. All rights reserved. The functions of the teres major are the arm adduction and arm internal rotation. The levator scapulae originates from the transverse processes of the vertebrae C1-C4. Last medically reviewed on January 23, 2018, The corpus spongiosum is yet another part of the male anatomy that facilitates sexual reproduction. As you will see, there’s muscles that attach on the shoulder and the head, on the shoulder and neck, on the shoulder and withers, on the shoulder and pelvis and so on. The nerve to the subclavius supplies this muscle. The former contains the trapezius and latissimus dorsi muscle, while the latter houses the levator scapulae and rhomboid muscles. 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